PIC12F617T-EMD View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC12F617T-EMD

8-Pin Flash-Based, 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC12F609/615/617/12HV609/615

12.2 Calibration Bits

The 8 MHz internal oscillator is factory calibrated.

These calibration values are stored in fuses located in

the Calibration Word (2008h). The Calibration Word is

not erased when using the specified bulk erase

sequence in the Memory Programming Specification

(DS41204) and thus, does not require reprogramming.

12.3 Reset

The PIC12F609/615/617/12HV609/615 device

differentiates between various kinds of Reset:

a) Power-on Reset (POR)

b) WDT Reset during normal operation

c) WDT Reset during Sleep

d) MCLR Reset during normal operation

e) MCLR Reset during Sleep

f) Brown-out Reset (BOR)

Some registers are not affected in any Reset condition;

their status is unknown on POR and unchanged in any

other Reset. Most other registers are reset to a “Reset

state” on:

• Power-on Reset

• MCLR Reset

• MCLR Reset during Sleep

• WDT Reset

• Brown-out Reset (BOR)

WDT wake-up does not cause register resets in the

same manner as a WDT Reset since wake-up is

viewed as the resumption of normal operation. TO and

PD bits are set or cleared differently in different Reset

situations, as indicated in Table 12-2. Software can use

these bits to determine the nature of the Reset. See

Table 12-5 for a full description of Reset states of all

registers.

A simplified block diagram of the On-Chip Reset Circuit

is shown in Figure 12-1.

The MCLR Reset path has a noise filter to detect and

ignore small pulses. See Section 16.0 “Electrical

Specifications” for pulse-width specifications.

FIGURE 12-1:

SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

External

Reset

MCLR/VPP pin

VDD

Sleep

WDT

Module

WDT

Time-out

Reset

VDD Rise

Detect

Power-on Reset

Brown-out(1)

Reset

BOREN

OSC1/

CLKIN pin

OST/PWRT

OST

10-bit Ripple Counter

On-Chip

RC OSC

PWRT

11-bit Ripple Counter

S

Chip_Reset

R

Q

Note 1: Refer to the Configuration Word register (Register 12-1).

Enable PWRT

Enable OST

DS41302D-page 110

 2010 Microchip Technology Inc.

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